Pump



Oct. 4, 1932. J. R. SANDAGE PUMP Filed Feb. 24. 19:50

2 Sheets-Sheet l Oct. 4, 1932. J R SANDAGE 1,880,494

PUMP

Filed Feb. 24, 1950 2 Sheets-Sheet 2 Ill/515.

- a cylindrical lining and has outlet ports Patented Oct. 4, 1932 UNITED STATES PATENT OFFICE Application filed .February 24, 1930. Serial No. 480,557.

This invention relates to pumps, and more particularly to reciprocating pumps, especially those required to run at high speed.

Generally stated, the object of the invention is to provide a novel and improved construction whereby a reciprocating piston is actuated by an eccentric cam directly engaging the piston, between the two heads thereof, the pump being double acting, so that for each stroke of the piston there is both an intake and an ofl'take of water or other fluid. I

Another object is to provide a novel and .improved arrangement and construction whereby the piston and its actuating eccentric cam have forced lubrication thereof.

Another object is to provide a novel and improved construction whereby the provision of valves for a pump of this kind is simplified and rendered more satisfactory and effective than in previous pumps of this general character.

It is also an object to provide certain details and features ofconstruction and com- 1 binations tending to increase the general efiiciency and the desirability of a pump of this particular character.

To the foregoing and other useful ends, the invention consists in the matters hereinafter set forth and claimed, and shown in the accompanying drawings, in which,

Fig. 1 is a longitudinal section of'a pump embodying the principles of the invention.

Fig. 2 is a horizontal section on line 2-2 in Fig. 1.

Fig. 3 is a transverse section on line 33 in Fig. 2.

Fig. 4 is a detail view of'certain parts of the pump construction.

As thus illustrated, the pump comprises a body or cylinder 1 provided with heads 2 held in place by bolts 3, said cylinder having member 4, as shown. The cylinder has inlet ports 6 and 7, as shown,

8 and 9 disposed diametrically opposite to said inlet ports. A casting in the form of a cap 10 is secured in place by bolts 11 to cover the ports 6 and 7, and has an inlet pipe 12, as shown. A

similar casting in the form of a cap 13 is secured b bolts 14 to the top or other side of the cy inder, to cover the ports 8 and 9, and has an outlet pipe 15, as shown.

Valves 16 and 17 are provided for the ports 6 and 7, and similar valves 18 and 19 are provided for the ports 8 and 9, the valves 16 and 17 opening inwardly, and the valves 18 and 19 opening outwardly, as shown. Each valve is preferably composed of one piece of metal stamped into the desired form, one edge portion thereof being enlar ed to form the pintle or axis portion 20, and it will be seen that the metal of the cylinder 1 and of the caps 10 and 13 is simply rooved to receive these portions 20, where y a twopart bearing is provided for each portion 20, as shown. By removing the bolts 11 and 14, the portions 20 can be removed from their bearlngs, and new valves can be substituted when necessary or desirable.

The'piston 21 is double acting, as it sustains fluid pressure at both ends thereof, and is adapted to reciprocate in the lining member 4 previously mentioned. This piston is laterally recessed at 22 to form the two shoulders 33 which engage the cylindrical eccentric cam 24 mounted on the end of the shaft 25, which latter is supported for rotation in the tubular casting 26 secured by bolts 27 to one side of the cylinder. The casting 26 preferably has a lining member 28, as shown, In which the shaft rotates, and the end of the casting 26 has a stufling box29 to prevent leakage. An oil cup 30 may be provided, as shown, to furnish lubrication for the shaft 25 in its bearings. A gasket or packing plate 31 is preferably interposed between thg inner end of the casting 26 and the cyl- 1n er, the end of the lining member 28, as shown. When the shaft 25 is rotated, by any suitable application of power thereto, the rotation of the eccentric cam 24 will reciprocate the piston 21 in a manner that will be readily understood, thus drawing in the water or other fluid through first one valve 16 and 17, and then the other, and forcing it out past first one valve and then the other, 18 and 19, whereby-there is an intake of water and an offtake of water for each stroke of the piston.

and between the eccentric cam 24 and In this way, at high speed, the pressure exerted by the pumpt is practically continuous or constant.

The other side of the piston is preferably recessed at 32 to accommodate the spline 33, which latter prevents the piston from rotating, while at the same time permitting to reciprocate freely. The spline has an inlet opening or duct 34 communicating with the oil cup 35, from which latter oil is fed through the duct 34 into the recess 32 in the side of the piston. Ducts 36 then conduct the oil from the recess 32 into the recess 22, in which latter the oil lubricates the eccentric cam 24: in a desirable manner. hen the piston 21 reciprocates, it will be seen that the spline 33 acts as a plunger to force the oil first through one duct 36 and then the other, thus providing forced lubrication of the eccentric cam and piston.

\Vith the foregoing construction, the pump is capable of operating at high speed, smoothly and without vibration. Also, the structure may be readily taken apart, for the purpose of repairs or substitutions,

It will be seen that the inlet casing 10 is separably secured to one side of the cylinder, but is so formed that it is entirely outside of the diameter of the bore of the cylinder. Similarly, the casing 13 is also detachably secured to the opposite side of the cylinder, but here again the detachable casing thus formed is entirely outside of the bore of the cylinder. In this way, a cylinder block is provided which is flat on top and flat on bots tom, and which is bored to receive the piston or plunger, and to which the inlet and outlet casings are secured, as well as the shaft hearing at one side thereof. But the bore of the cylinder is entirely in the cylinder block, as no portion of the cylinder bore is formed in either the inlet or the outlet casing, or in the detachable shaft bearing.

What I claim as my invention is:

1. In a pump, the combination of a cylinder, a double-headed or double-acting piston arranged to reciprocate in said cylinder, an eccentric cam engaging said piston, with its axis at right angles to the longitudinal axis of the piston, a shaft for rotating said eccentric cam, a removable inlet casing entirely outside of the diameter of the bore of said cylinder, fastened on one side of said cylinder, a fluid connection for said casing, a removable outlet casing entirely outside of the diameter of the bore of said cylinder, fastened on the opposite side of said cylinder, a fluid connection for said outlet casing, two alternately-operating valves for the inlet casing, two alternately-operating valves for the outlet casing, and cylinder heads detachable without disturbing said casings and valves, said piston having a lateral spline holding it against rotation, on the inner side arranged to reciprocate in said cylinder, an

eccentric cam engaging said piston, with its axis at right angles to the longitudinal axis of the piston, a shaft for rotating said eccentric cam, a removable inlet casing entirely outside of the diameter of the bore of said cylinder, fastened on one side of said cylinder, a fluid connection for said casing, a removable outlet casing entirely outside of the diameter of the bore of said cylinder, fastened on the opposite side of said cylinder, 2. fluid connection for said outlet casing, two alternately-operating valves for the inlet casing, two alternately-operating valves for the outlet casing, and cylinder heads detachable without disturbing said casings and valves, said valves comprising plates each having one edge enlarged to providea cylindrical pintle or axis portion, said cylinder having means providing a sectional or split bearing for each axis portion.

3. In a pump, the combination of a cylinder, a double-headed or double'acting piston arranged to reciprocate in said cylinder, an eccentric cam engaging said piston with its axis at right angles to the longitudinal axis of the piston, a shaft for rotating said eccentriccam, a removable inlet casing entirely outside of the diameter of the bore of said cylinder, fastened on one side of said cylinder, a fluid connection for said casing, a removable outlet casing entirely outside of the diameter of the bore of said cylinder, fastened on the opposite side of said cylinder, a fluid connection for said outlet casing, two alternately-operating valves for the inlet casing, two alternately-operating valves for the outlet casing, and cylinder heads detachable without disturbing said casings and valves, said piston having a recess in one side thereof, whereby this side is open, and being closed at its other side, said cam being disposed in said recess, and stationary lubricating means at the closed side of the piston, the piston at its closed side having lubricating ducts extending from said lubricating means to said cam.

4. In a pump, the combination of a cylinder, a double-headed or double-acting piston arranged to reciprocate in said cylinder, an eccentric cam engaging said piston, with its axis at right angles to the longitudinal axis of the piston, a shaft for rotating said eccentric cam, a removable inlet casing entirely outside of the diameter of the bore of said cylinder, fastened on one side of said cylinder, a fluid connection for said casing, a removable outlet casing entirely outside of the diameter of the bore of said cylinder, fastened on the opposite side of said cylinder,

a fluid connection for said outlet casing, two alternately-operating valves for the inlet casing. two alternately operating valves for the outlet casing, and cylinder heads detachable without disturbing said casings and valves, said piston having a recess in one side thereof, whereby this side is open, and being closed at its other side, said cam being disposed in said recess, and stationary lubricating means at the closed side of the piston, the plston at its closed side having lubricating ducts extending from said lubricating means to said cam, together with a spline forming part of said stationary lubricating means, said piston having a groove for said spline, whereby the piston is prevented from rotating or turning about its longitudinal axis.

5. In a pump, the combination of a cylinder, a double-headed or double acting piston arranged to reciprocate in said cylinder, an eccentric cam engaging said piston, with its axis at right angles to the longitudinal axis of the piston, a shaft for rotating said eccentric cam, a removable inlet casing entirely outside of the diameter of the bore of said cylinder, fastened on one side of said cylinder, a fluid connection for said casing, a removable outlet casing entirely outside of the diameter of the bore of said cylinder, fastened on the opposite side of said cylinder, a fluid connection for said outlet casing, two alternately-operating valves for the inlet casing, two alternately-operating valves for the outlet casing, and cylinder heads detachable without disturbing said casings and valves, said valves having pivots, and said cylinder and casings having means providing a split or separable bearing for each of said pivots, each casin being separately removable and thereby aii ording access to and separate removal of each valve.

Specification signed this 19th day of February, 1930.

JACOB R. SANDAGE. 

